My son is 22 and boy do I worry, he is a good boy and never really caused me to worry only like you late night's several times when I have woken and he is not home I text to see if he is ok.
When he first passed his driveing test I made him come home by 10pm if he took the car as my daughter who is a police officer said most boy racer accidents were after 11pm, my husband said you can't do that but I said whilst we pay for his car I will.
He graduated last month and is currently traveling around America and Hawaii with a friend for 6 weeks I asked him to text me as he arrive in each destination and bless him he has only I did forget the time differance and it has been in the middle of the night but hey cannot complain he is doing as he was told.
